/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package edu.capex.javaee.cookies;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Acer
 */
public class cookieServlet extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            Cookie[] cookies = request.getCookies();
            Cookie tokenCookie = null;

            if(cookies != null){
                for (int i= 0; i < cookies.length; i++) {
                    if(cookies[i].getName().equals("token")){
                        tokenCookie = cookies[i];
                        break;
                    }
                }
            }

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Extracting the token cookie</title>");
            out.println("</head>");
            out.println("<body style='font-family:arial;font-size:12pt'>");

            String resetParam = request.getParameter("resetParam");
            if(tokenCookie == null || (resetParam != null && resetParam.equals("yes"))){
                Random rnd = new Random();
                long cookieid = rnd.nextLong();
                out.println("<p>Welcome. A new Token "+ cookieid +" is now established </p>");
                tokenCookie = new Cookie("token", Long.toString(cookieid));
                tokenCookie.setComment("A cookie named token to identify user");
                tokenCookie.setMaxAge(-1);
                tokenCookie.setPath("/HandleSession/CookieServlet");
                response.addCookie(tokenCookie);
            }else{
                out.println("<p>Welcome back. Your token is "+tokenCookie.getValue()+".</p>");
            }
            String requestURLSame = request.getRequestURL().toString();
            String requestURLNew = request.getRequestURL() +"?resetParam=yes";

            out.println("<p> Click <a href="+requestURLSame+"> here</a> again to continue browsing with the same identity. </p>");
            out.println("<p> Otherwise, click <a href="+requestURLNew+"> here</a> to start browsing with a newidentity. </p>");

            out.println("</body>");
            out.println("</html>");
        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
